Back to Search
Start Over
Effect of Rice-Straw Biochar Application on the Acquisition of Rhizosphere Phosphorus in Acidified Paddy Soil.
- Source :
-
Agronomy . Jul2022, Vol. 12 Issue 7, p1556-N.PAG. 12p. - Publication Year :
- 2022
-
Abstract
- A serious acidification trend currently affects paddy soil and soil phosphorus (P) availability has declined in rice production. This study investigated the effect of rice-straw biochar on P availability and the adaptability of rice roots in acidified soil. Rice was grown in rhizoboxes, allowing for the precise sampling of rhizosphere and bulk soil for the sequential extraction of P fractions. Biochar may provide a liming effect and strong nutrient adsorption, leading to soil improvement. The results confirmed that biochar application significantly improved plant growth and P accumulation in shoots by 29% and 75%, respectively. However, the application of washed biochar and equivalent lime only increased shoot biomass and P accumulation by 13.4% and 11.2%, and by 42% and 38%, respectively. Compared with the control, applying biochar increased the plant-available P component contents in rhizosphere and bulk soil. Biochar affected the chemical balance among the different P fractions, increased aluminum-bound phosphate (Al-P) pool, calcium-bound phosphate (Ca-P) pool and decreased the occluded phosphate pool in acidic paddy soil. Biochar amendment significantly improved root growth of and increased the citrate exudation from roots under low P supply, accompanied by the enhanced expression of the anion-transporter-related OsFRDL4 gene and the OsPT1 phosphate transporter. The results showed that biochar application in degraded acidic soils could improve rice potential for P acquisition to increase available P component and maintain high citrate exudation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BIOCHAR
*ACID soils
*RICE straw
*SOILS
*RHIZOSPHERE
*ROOT growth
*PLANT growth
Subjects
Details
- Language :
- English
- ISSN :
- 20734395
- Volume :
- 12
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Agronomy
- Publication Type :
- Academic Journal
- Accession number :
- 158175825
- Full Text :
- https://doi.org/10.3390/agronomy12071556